Universal Back Button (UBB) is a simple app that implements a back button that in principle "works everywhere." The idea came from Oliver Boermans, in a blog post titled "The universal back button," in response to Brent Simmons' post on "Apps that work together." (See where I got the name?) The idea is to provide a back button that takes you back to the task you were working on, before you opened a file, clicked a link, or similar.

Author's Note: Please read this blog post to learn how to make Universal Back Button work on your Mac if you are running Mac OS X 10.6.5 or later!